Divide. −3 3/4÷3 1.−1 1/4 2.−3/4 3.3/4 4. 1 1/4
1 answer:
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Answer:
4.5126 approximately 4.5
Step-by-step explanation:
First of all, we need to identify the type of data that we are receiving, in this case we got a finite amount of data, a discrete set of data, 11 of them to be precise, so the first parameter: the size of the sample (N) is equal to 11.
So, for this problem we goin' to use the formula for standard deviation for discrete variables that it's given by: see the attached image
where σ correspond to the standard deviation, μ correspond to the mean (in this case μ = 70 decibels) , xi correspond to each of the data values and i correspond to a counter beginning in i=1 with x1 = 68 and ending in i=N=11 (the size of the sample) with x11=68.
Finally we operate using the formula and we obtain that the standard deviation of this sample is equal to 4.5126
